A person that is so enthusiastic about films and film and general it should be against the law, as is the case with pedophiles.

A Cinephile is never ceases to talk about how fantastic (or not) the most recent film they saw was, and how what's happening to them right now is just like the scene from a specific movie you've probably never seen, but they insist is a classic.
They also quote movie quotes and do character impressions ALOT.